Can I replace just the headlight adjuster for the March, or do I need to replace the entire headlight assembly?

I just bought a used 2009 Accent with 90,000 km on it. Do I need to replace the timing belt?

Can the headlight assembly of the 2016 Kaiyi X3 be replaced with separate high and low beams?

I recently replaced the headlight assembly on my Kia 2009 Sportage, and now I'm facing two issues: 1. The headlights can't switch between high and low beams. 2. The headlight level adjustment switch on the central control dashboard is not working; turning the switch doesn't affect the headlights.

The air conditioning internal circulation of the 2016 Hongqi H7 with the chrysanthemum logo is broken. How can it be repaired? Is it that one of the shafts of the air conditioning flap is broken? Do I have to replace the entire air conditioning assembly?

The front clip of the electric seat adjustment panel is cracked. Do I need to replace the entire assembly?

How do I replace the headlight bulb on a Sharan?

How to repair a damaged chrome strip on the front grille, or should I replace the entire assembly?

Car enthusiasts: If one fuel injector is broken, can I just replace that one, or do I need to replace all four?

Why is it indicating that I need to change the oil again when I just changed it in March?

I've heard that the vacuum pump on the Jeep is leaking oil. I've already replaced two gaskets, but it's still leaking. I've been told that I might need to replace the entire assembly. Is that true? Can fellow car enthusiasts share their experiences?